ECGs
A) are most useful in diagnosing heart murmurs.
B) show the summed electrical potentials generated by all cells of the heart.
C) have two major components: waves and nodes.
D) provide direct information about the heart function.
E) measure the mechanical activity of the heart.
B) show the summed electrical potentials generated by all cells of the heart.
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Hypothetically, if a muscle were stretched to the point where thick and thin filaments no longer overlapped, ________.
A) cross bridge attachment would be optimum because of all the free binding sites on actin B) no muscle tension could be generated C) maximum force production would result because the muscle has a maximum range of travel D) ATP consumption would increase because the sarcomere is "trying" to contract
The most important regulator of electrolyte concentrations in extracellular fluids is ________.
A) insulin B) aldosterone C) glucagon D) cortisol
Segmentation is
a. the primary motility in the small intestine during digestion of a meal b. both mixing and propulsive c. sequential ring-like contractions that sweep downward, creating a stripping motion that pushes the chyme forward d. a and b e. all of the above
Intervertebral discs exhibit a great deal of strength because of the presence of thick bundles of
A. elastin. B. collagen. C. hydroxyapatite. D. proteoglycan. E. calcium.